I Gede Agus Widyadana PhD has been working as an Industrial Engineering lecturer for almost 20 years at Petra Christian University, Surabaya, Indonesia. Gede received his PhD from Chung Yuan Christian University, Chung Li, Taiwan. Besides being a lecturer, Gede was also a visiting assistant professor at Sophia University, Tokyo, Japan, from April 1 to June 30, 2014. His research focuses on supply chain modeling, inventory management, and humanitarian logistics. Gede has published in many high-ranking journals, such as OMEGA, International Journal of Production Economics and International Journal of Production Research. Apart from being an author, Gede is also a reviewer for several reputable journals, such as International Journal of Systems Science and Applied Mathematical and Modeling. He has provided training and become a consultant in production planning and control for several industries, including PT Wings Surya, PT Surabaya Autocom, and PT Adicitra Bhirawa.